I'm nihongo jouzu so I mostly watch the JPs. I used to mostly watch Michiru because she used to stream souls games and kusoge. Michiru would stream for an extreme amount of hours while she fought bosses with 0 armor to fast roll, very underleveled stats, and using a shit mace weapon. Her most remarkable moment was when she streamed for 15 hours trying to beat Rennala with that shit build, spending the entire night attempting to beat her, and even eating breakfast on stream as the sun rose up until she eventually managed to defeat her. She however started spamming streams joining massive Japanese RP servers (something pretty common within small JP streamers) and I kinda lost interest but I still tune in.
I now mostly watch Nasa who has a really cute voice, cute mannerisms, and more varied content. I especially like her collabs with Pico since Pico oshis Nasa even prior to joining Phase which is really sweet.
The other JPs are good and have pretty distinguishing content.
Except Iori, she's the Senpai Gomenne NTR annoying fujoslut gigayab harbinger (also the only JP who knows English and is largely very Americanized). I found her voice grating and her streams largely monotonous so I don't really care.